330 kV倒置式电流互感器喷油事故分析及预防措施
刘威峰，闫振华，周秀，马云龙，李奇超，徐玉华
（国网宁夏电力有限公司电力科学研究院，宁夏 银川 750011）
摘 要：针对一起倒置式电流互感器的喷油事故，分析了互感器的结构及绝缘特点，综合三比值法、特征气体组分、大卫三角形法对试验数据进行判断，并结合解体检查认为造成此类故障的原因：一是主绝缘制造工艺不良，绝缘包裹过程包扎不均匀，极易引起局部电场不均匀、局部发热；二是安装工艺不良引起密封不严所致，极易引起绝缘内部受潮。上述缺陷会引起绝缘油劣化分解产生大量气体，严重者导致头部金属膨胀器冒顶、喷油甚至爆炸事故，给出了相关处理措施，避免此类故障再次发生。
关键词：倒置式电流互感器；膨胀器；油中溶解气体；绝缘油
中图分类号：TM452 文献标识码：B 文章编号：1007-3175(2020)02-0058-04
Analysis and Preventive Measures of 330 kV Inverted Current Transformer Oil Injection Accident
LIU Wei-feng, YAN Zhen-hua, ZHOU Xiu, MA Yun-long, LI Qi-chao, XU Yu-hua
（State Grid Ningxia Electric Power Company Electric Power Research Institute, Yinchuan 750011 , China）
Abstract: Aiming at an oil injection accident of inverted current transformer, this paper analyzed the structure and insulation characteristics, synthesized three-ratio method, characteristic gas component method and David triangle method to carry out judgments for testing data, and combined strip inspection to conclude this type of faults causes: on the one hand, major insulation manufacturing technique badness and insulation-wrapping process bind-up asymmetry are easy to cause the partial electric field asymmetry and local heating, on the other hand, the installation technology badness causes untight seal, easy to cause insulation interior damp. The above mentioned defects will cause the insulation oil degradation decompose to generate a large amount of gas, which may cause the head metal expander collapse, the oil injection or even the explosion accident. This paper gave the relevant treatment measure to avoid this type of faults happening again.
Key words: inverted current transformer; expander; dissolved gas in oil; insulating oil
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